package org.apache.shiro.session.mgt;

import javax.servlet.http.HttpServletRequest;

public class IpUtils {
	public IpUtils(){}
	
	public static String getIpAddr(HttpServletRequest request){
		if(request == null){
			return "unknown";
		}
		
		String ip = request.getHeader("x-forwarded-for");
		
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Forwarded-For");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
		
		return ip;
	}
}
